Question

type the number of each subatomic particle into the blanks: protons protons protons 54 ? 18 ? ? ? xe ar neutrons neutrons neutrons xenon argon electrons electrons 131.29 39.95 ? ?

Explanation:

Step1: Recall atomic number property

The atomic number is equal to the number of protons and electrons in a neutral atom. For Xe, atomic number is 54, so number of protons = 54 and number of electrons = 54. For Ar, atomic number is 18, so number of protons = 18 and number of electrons = 18.

Step2: Calculate number of neutrons

The mass - number is approximately the sum of protons and neutrons. For Xe, mass - number is approximately 131. So number of neutrons = 131 - 54 = 77. For Ar, mass - number is approximately 40. So number of neutrons = 40 - 18 = 22.

Answer:

Xe: Protons: 54, Neutrons: 77, Electrons: 54
Ar: Protons: 18, Neutrons: 22, Electrons: 18